ORDER INTESTINA. 463 
such as the wolf, the dog, the marten, and even man, remain- 
ing there convoluted upon itself, causing this organ to swell, 
destroying the parenchyma, and, in all probability, occasion- 
ing the severest pains to the individual in which it has taken 
up its abode. These worms have been sometimes passed in 
urine, while they were still small. This species also some- 
times inhabits other viscera. It is often of the finest red 
colour. It has six papillz around the mouth, the intestine is 
straight and wrinkled transversely, the ovary simple and three 
or four times longer than the body, communicating externally 
by a hole a little behind the mouth, and as it would seem, its 
other extremity opening into the anus. A very fine white 
filament which extends along the belly, has been thought by 
M. Otto to be the nervous system. 
From the ascarides and strongyli, have been lately distin- 
guished 
SPIROPTERA, 
Whose body is terminated in a spiral, surrounded with two 
wings, from between which the penis issues. 
It is said that a species of them is sometimes found in the 
human bladder. 
There is one in the mole, Sp. strwmosa. Nitsch., which 
passes itself into a ring which it pierces in the inmost coat of 
the stomach, and retains itself there by a small tubercle. 
PHYSALOPTERA, 
In which the posterior extremity has a bladder between two 
small wings, and a tubercle from which the penis issues. 
SCELOROSTOMA. Blain., 
Which have at the mouth six small denticulated scales. 
There is one in the horse, and one in the hog. 
